All H12-821_V1.0 Test Inside Huawei Questions

In the provided configuration, IS-IS is enabled on Loopback0 but not on Loopback3 of R2. As a result, R2 will advertise the route 10.0.2.2/32 (from Loopback0 ) to R1 through IS-IS. However, the route 10.0.2.3/32 will not be advertised because IS-IS is not enabled on that loopback interface. The import-route direct command does not override this behavior ​.

 During WLAN roaming, the STA sends a Reassociation Request frame to the foreign AP to maintain connectivity. Association frames are used during initial connections, not roaming.

 APs with which a STA is associated before and after roaming can work on different channels, as roaming often occurs across channels in environments like multi-SSID or multi-channel setups.

Options C and D are false, as they contradict standard WLAN roaming procedures ​.

Comprehensive and Detailed Step-by-Step Explanation:

Portal Authentication:

Portal authentication uses a web-based mechanism where clients are redirected to a login page.

Communication between the access device and Portal server uses HTTP or HTTPS protocols.

Correct Statements:

Option A: HTTP or HTTPS is used for Portal authentication.

Option D: Portal protocol packets are transmitted over TCP for reliable communication.

Incorrect Statements:

Option B: Port 2000 is not the default for processing Portal packets.

Option C: The default destination port for communication with the Portal server is not 50100.

Comprehensive and Detailed In-Depth Explanation:

Spanning Tree Protocol (STP) has long convergence times due to Listening and Learning states .

Rapid Spanning Tree Protocol (RSTP) introduces:

Proposal/Agreement (P/A) mechanism → Allows ports to quickly transition to Forwarding state without waiting.

This mechanism significantly reduces convergence time in a switched network .

Since RSTP does use the P/A mechanism to accelerate port forwarding, the statement is true .

???? Reference: Huawei HCIA-Datacom Study Guide, STP vs. RSTP and P/A Mechanism.